Automatically-extensible hoisting mast



P. H,. MALLINCKRODT AUTOMATICALLY EXTENSIBLE HOISTING MAST Filed June 7,1 922 .Fhs. Zn.

INVENTOR Patented Dec. 1, 1925.

UNITED STATES PHILIP I-I. MALLINCKROIDT, F SALT LAKE CITY, UTAH.

AUTOMATICALLY-EXTENSIBLE HOISTING MAST.

Application filed June 7, 1922v Serial No. 566,604.

Salt Lake, and State of Utah, have invented a certain new and usefulAutomatically- Extensible Hoisting Mast, of which the following,together with the accompanying drawing, forms a full, clear, and exactspecification, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to an automatically extensible hoisting mast, andits principal o-b'ects are:

*irst. To provide a device whereby a load may be hoisted to a certaindesired height, in cases where only a part of that height is availablefor placing a permanent, rigid, hoisting structure.

Second. To provide means whereby a load suspended from a rope or otherwrapping connector, may be hoisted to a pre-deter mined height bypulling on the said rope "from a certain rigid structure which is lessin. height than the pro-determined height.

Third. To make it possible to hoist a load from a point below a givenpoint, to a third point above the given point, by simply winding up arope or other wrapping connector having one end thereof attached to thesaid load, and the other end attached to a hoisting mechanism locatedbelow the given point.

Fourth. To provide a device whereby a load may be moved from one point,to a second point remote from the first point, by the progressiveshortening of a continuous rope or other wrapping connector passing overa fulcrum member located between the two said points, the device beingso arranged that when the load has reached a nc-determined point of itstravel,. a rigid member shall be automatically engaged to furnish asupport for the load while the load is being carried to the said secondpoint.

Fifth. To provide a device which shall be simple and durable.

Sixth. To supply an efficient mechanism for the purpose mentioned.

In attainingthe ob1ects outlined above, I provide a mast portion whichis fixed, relatively to a second or movable mast portion;

The movable portion may be connected to the fixed portion in anysuitable manner, so that there will be a telescoping action between thetwo. As the top of the movable portion may be mounted one or morerotatable members, such as grooved sheaves or chain wheels, and near thebottom oi the movable member I mountanother rotatable member. At the topof the stationary structure I also mount a rotatable memher; a. wrappingconnector, such as a chain or wire rope, is provided for hoisting, andthis connector is adapted to be connected to the load in any suitablemanner, for instance by a hook, clevis, or other equivalent device. Fromthe load, the rope extends upwardly, over the rotatable member of themovable mast portion, down to the sheave fixed at the lower part of themovable mast portion up again around the sheave at the top of the fixedmast portion, and then down to any suitable hoisting device, such as achain block or winch.

In winding'up the rope, the load will begin to rise and will be liftedto the top of the movable mast portion, on which is fixed a stop memberlocated at a point somewhat below the sheave; a second stop portion,which may be fixed to the rope at a point somewhat above the load, andadapted to contact the first stop member.. Upon the further winding upof the rope it be gins lifting the movable member, the load of coursecontinuing to move up accompanied by the movable member. The lifting ofthe load continues to the limit, of motion possible between the two mastportions.

This device is designed especially for lifting loads out of basementsopening on to side walkswhere the openings must normally be kept coveredand where permanent hoisting structures wouldnot be allowable on accountoi. obstructing the sidewalks. Other instances of usefulness willreadily oc our to the skilled mechanic.

The present device. furthermight include a plurality of mast sectionsextensiblyl disposed in relation to each other, and adapted toautomatically have the extension travel take place after astop portionlocated on a rope or chain, which is suitably interconnected withthemast portions, has come into contact with a second stop portionlocated on one of the said mast sections.

The features of this invention on which i the protection of LettersPatent is desired,

Referring tothe drawing, 20 represents a fixed mast portion which mayconsist of two steel channels spaced apart from each other, as shown inFig. 1. This mast may be anchored tothe floor 2.1 in any wellknownmanner, and thetop ot'the. mast may be anchored to the wall 24 by meansof a yoke brace 25.

A movable mast portion 26, which may be made of metallic pipe, may beplaced to one side of the fixed'mast 20 and be adapted to travel alongthe latter in lined lateral relation thereto, by means of the brackets27 and 28, each of which may embrace themovable mast; portion, andextend in two branches overlapping the sides of the mast 20. The bracket27 may carry two traction wheels 30,, which may be-journaled on the pins81, these wheels being disposed on each side of the mast 20 in a mannerto engage the channel members of the mast, between the flanges thereof.clearance is left between the circumferences of the wheels and.theinside surfaces: of the flanges so that the wheels will turn freelyon the-pins 31, and so they may contact either one ot the flangesurfaces, though in this instance, the disposal of the load,willpull'the wheel 30 towards the flange nearest the movable member 26.Another traction wheel 32 may be rotatably mounted on the pin 34 betweenthe side portions of the bracket 28. The bracket 28 may have lipportions 35 forming guards on each side of the mast and extendinginwardly over the flanges th-ereoii to prevent any disengage mentbetween the bracket 28' and the mast 20. The traction wheel 321112. bearagainst the flat nieces of the mast channels as a track.

At the top of the movable portion 26 there may be an overhanging armvtermed of two steel channels .36, which may be attached thereto- .by.pins or bolts .37. I The two channels 8.6 may he connectedby a plateportron-38, which may term the integral, front partofalineebraee .39,which iii-turn may have a foot portion 40 rigidly fae': tened t the mast2c. ,etweenfthe- .a a

channels 36 may he mounted th sheaves 41, and .452 which. are

A slight amount of and the bottom 6.0 Of the the pins 43 and 44respectively, the pins being secured in the channels 36. Another chainsheave 45 may be rotatably disposed in the bracket 27 and still anothersheave 46 may be rotatably mounted between the channels of the mast 20.

A bracket 47 may be rigidly mounted on the mast 20 and a chain block 48,having the usual book 49, may be suspended from the end of the bracket47. The chain block need not be particularly described here, furtherthan to state that it may be of the spur-gear type with an internalbraking mechanism tor supporting a load at any stage of the hoisting.Such chain blocks are made by various nmnu'tacturers and the generalconstruction and use thereof are well. known.

The operating wheel of the chain block is shown at 50, and'the operatingchain at 51. A hook for supporting a load, isshowu at 52, and a loadchain at 58, extending from the hook upwardly to and around the chainwheel 41, and; then, in order, to and around the chain wheels 42, 45 and46. Inasmuch as the chain blocks named, usually pull. the load chainfrom the bottom, an idler chain wheel 54 is provided, around which theload chain 53 passes as-it comes. from the chain wheel 46. From theidler 54, the load chain 5-3 passes up into and through the chain block,

In hoisting the load, the operator pulls the hand chain, 51 in theproper direction. thereby starting the book 52 upwardly, and continuing.until the upper part 56 of the hook 52, which forms a stop portion,strikes the plate 36 which forms a second step portion adapted tocon-act with the first stop portion 56. A Further pull on the load chainwill leave that part of the load chain between the chain sheaves 41 and45, stationary relatively to the mast portion 26, and will cause themovable portion 26 to move upwardly to any desired height within thecapacity of the structure, for in. stance, to the position shown in Fig.3.

In cases where it is dcsirerfl to bring the load over to either side ofthe hatchway 57. as indicated by the arrows in 1, this may beaccomplished by mounting the mast 20 in such a way (not shown) that itmay have an angular movement around its vertical axi instead of mo tingit rigidly as is shown in the p ,sent d T is. however, canbeaeeomplisliec by any skilled mechanic and so forms no. part of my inention.

It will be noticed that the brackets 2.7 and 28 with app irtenan esmavhe aid t form a carriage for moun ng the le t 2 ast. 6:, may 1 .0 m astop'for the downward t igrel 0 vention is described herein, it is to beclearly understood that the details of the invention may, or may not, beshown in the preferred,

forms; further, that the preferred forms may be considerably varied fromtime to time, depending upon the circumstances and conditions governing,and governed by, the development of this invention and the arts to whichit is incident, so that the scope oi this invention is to be interpretedfrom the claims in which its spirit is broadly generalized.

Having fully described my invention, what I claim is:

1. In a device of the kind described, a mast portion adapted to movablyengage a second mast portion and to be longitudinally guided therealong,a sheave on the said first mast portion, a second sheave on the said'irst mast portion at a point below the first sheave, another" sheavemounted on the said second mast portion at a point above the said secondsheave of the first mast portion, a wrapping connector having one enddepending from the first sheave, while the other end extends to, andaround, the second. sheave of the first mast portion and around theother sheave ot the second mast portion in the order named; a hoistingmeclninism to which the other end oi the w 'apping connector may beattached, a stop portion located on the said wrapping connector at apoint below the said first sheave, and a stop portion located on the aidfirst mast portion at a point between the said first sheave and the saidfirst stop portion.

2. The combination with two mast portions relatively movable to eachother longitudinally of a stop portion located on one of the said mastportions, a hoisting mechanism mounted on the other mast portion, awrapping connector having a free end with a stop portion fixed theretoin operable relation to the first stop portion, the said hoistingmechanism adapted to engage the other end of the said wrappingconnector, and a plurality of guide members disposed on both the saidmast portions in i such a manner that the said wrapping connector maypass around the said guide members, and the hoisting mechanism, and bywinding up the said wrapping connector, shall first cause a travel ofthe wrapping connector alone, until the said step portions come incontact, and then shall cause a cer tain travel between the said mastportions.

3. A mast, a mast extension arranged for longitudinal movement along thesaid mast, a guide sheave on the mast, an upper guide sheave and a lowerguide sheave on the mast extension, a wrapping connector arranged topass simultaneously over the said guide sheaves, and a stop on the saidwrap ping connector, said stop being arranged to engage the said mastextension at a point of its travel.

4. In combination, a structure, an exten sion arranged to rise above thesaid structure, a wrapping connector passing operatively from the saidstructure to the said extension, a guide for said connector on saidstructure, guides for said connector spaced apart't'rom each other onsaid extension, a stop at one end of the said connector arranged toengage the extension, and means for drawing the said. connector over theguide on said structure.

In testimony whereof, I sign my name hereto.

PHILIP H. MALLINCKRODT.

